Bump MSRV to 1.56

.github/workflows/test.yml

@@ -32,9 +32,8 @@ jobs:
       - run: cargo test --doc --all-features --color=always -- --color=always
 
   # later this may be able to be included with the below
-  # kept seperate for now as the following don't compile on 1.38.0
-  # * rkyv
-  # * criterion
+  # kept separate for now as the following don't compile on 1.56.1
+  # * arbitrary
   rust_msrv:
     strategy:
       matrix:
@@ -44,11 +43,11 @@ jobs:
       - uses: actions/checkout@v2
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.38.0
+          toolchain: 1.56.1
       - uses: Swatinem/rust-cache@v2
       # run --lib and --doc to avoid the long running integration tests which are run elsewhere
-      - run: cargo test --lib --features unstable-locales,wasmbind,oldtime,clock,rustc-serialize,winapi --color=always -- --color=always
-      - run: cargo test --doc --features unstable-locales,wasmbind,oldtime,clock,rustc-serialize,winapi --color=always -- --color=always
+      - run: cargo test --lib --features unstable-locales,wasmbind,oldtime,clock,rustc-serialize,winapi,serde --color=always -- --color=always
+      - run: cargo test --doc --features unstable-locales,wasmbind,oldtime,clock,rustc-serialize,winapi,serde --color=always -- --color=always
 
   rust_versions:
     strategy:

Cargo.toml

@@ -11,6 +11,7 @@ readme = "README.md"
 license = "MIT/Apache-2.0"
 exclude = ["/ci/*"]
 edition = "2018"
+rust-version = "1.56.0"
 
 [lib]
 name = "chrono"